<!doctype>
<html>
	<head>

	</head>
	<body>

	<div id="xx1"></div>
<div id="xx2"></div>
<div id="xx3"></div>
<div id="xx4"></div>
<div id="xx5"></div>
		
		
		<script>
let set = new Set(["a","b","c"]);
console.log(set);
let a = [...set];
console.log(a);
		</script>
	</body>
</html>